Pergussion-drill



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F. H. BER.

,Percussion Drill. No. 244,705. Patented May 17,1881.

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Paten-ted May 17,1881.

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UNITED `STAT-113s. s

PATENT ennui; H, OBnaoF DENVER, COLORADO.

PERCUSSION-Daim.

SPECIFICATION forming part of Letters Patent No. 241,705, dated May 1,'7, 1881,`

Application filed February .21, 1881.

To all whomt't may concern:

Beit known that L'FRANK H. OBER, a citizen of the United States, residing at Deliver, in the county of Arapahoe and State of Golorado,` have y invented certain new and useful Improvementsin Percussion-Drills; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyingdrawings, and -to letters or gures of` reference marked thereon, which form apart ot' this specification, in Which- Figure 1 is a side elevation, showingthehammer and drill in operation, the `successivepositions of the hammer bein g shown in dotted lines. Fig. 2 is a front elevation. Fig. 3 is a plan View. Fig. 4 is an enlarged section through the bearings. Fig. 5 shOWs an enlarged front and back viewof the hub and parts of the arms. Fig. Gis an enlarged vertical section of the drillcarrier.` Fig. 7 shows enlarged `perspectiveviews of the two sections of the drill-socket. Fig. Sis an enlarged view of the pawl and ratchet for rotating the `drill-socket. Fig. 9 is an enlarged vertical section `through one of the hammers, show.-v ingthemannerot'its attachmenttotherod. Fig. lO'is an enlarged perspective view, showing a hammer-rod and clamping device. Fig. 11 is an enlarged top viewof one of the hammer-bearing arms, showing the position of the hammer and its rod at the time of striking the drill and its subsequent movement to one side. Fig. 12 is an enlarged front View of the hammer in the `position shown in Fig. 1l.

My invention relates to that class of drills known as percussion rock-drills, and `is intended for prospecting purposes, and has for its object the production of a drill which shall be simple in construction and strong in every part, with the wearing parts easily renewed, with the minimumof Weight, so as to be easily transported from place to place 5 and it consists in the construction and operation ofparts hereinafter more fully shown and described.

A represen ts a vertical metal cylinder secured to a platform, B, of suitable dimensions, preferably of suflicient size to permit the operator to stand upon it While operating the crank. Into this cylinder is placed a neatly-fittingcentral post, A', vertically adjustable by means of,

(No model.)

a set-screw, a', `and sustaining a ci utch, C, provided With vertical armsc c, affording bearings for the shaft E. The `shaftiE carries a crank, E', on one end and a hubwith two arms, F F, on the other. The crank and 4hub arelittedon feathers c c', and held up to the `arms cc by nuts and washer.

The hub and arms F F maylbe made in one piece of metal or in separate pieces joined together by any suitable means. The hub. may

carry two or more arms, as maybe desired; 'Or,.

in lieu of the arms, a wheel ora diskof metal ma y be used with the triangular head orits equiv aient.

The armsF are.of suitable uniform length, and terminate in a head, F, of suitable form and size, preferably triangular, so `as thenlore readily to adjust a slotted plate, f, whichpis bolted to thehead, so as to give the slot an angle of about thirty-tive degrees divergence froln a perpendicular at the time the ham merG strikes the drill-head.

The hub is provided Vwithtwo depressions, f'f, one on each .side ofthe shaft, for holding the ends of' the hammer-rods g g, Which may be made of any suitable elastic metal. The

ends of the hammer-rods are upset, forming the rod will hold the hammer forward to the front end` ofthe slot in the platej' until the blowis delivered. l

The clamp g. is a conical-shal'ied .bolt terminating ina screw and nut composed of two sections, and hollowed out to receive the rod g and its upset head. One section of the clamp is shorter than the Otller, and `is `provided with a projecting iian ge that enters a coincident depression in the` other section, when .they are closed together over the head of the rod and drawn tightly into the eye of the hammer by means ofthe nut. y

Aframe, D, is hung on the shaft E by means of twoarms, d d, that extend from its upper end and permit the frame to have a free verti IOO cal movement for adjustment to hold the drill within an angle of forty-five degrees between a vertical and horizontal position, as may be required by the work. The lower end of the frame terminates in a broad plate, to which is bolted a drill-carrier, H, which extends to a point beneath the hammers as they descend, and is provided with a leg, h, and a projection for receiving and holding the drill-socket I. The leg rests upon the ground and sustains the weight of the drill-carrier. The carrier H has a circular opening, into which is set a drillsocket, 1, which is a cylinder with an angular central opening having angles coincident with the angles of the series of drill-rods used. The socket is constructed in two equal parts and provided with serrated anges at the top, which form the ratchet for engaging the pawl K. The socket is held in the carrier by two pins, t' t', ou opposite sides, that pass through the carrier and a groove extending around the outside ofthe socket.

The pawl K is pivoted in the center of the carrier H, with its outer arm, 7c, extending over the side of the carrier for engagement with the arm F, and its inner end is connected by a spiral spring to the carrier H a suitable distancefromthepivotalpoint. Angerishinged to the inner end of the pawl, and is held in contact with the ratchet by a spiral spring attached to a pin on the pawl near its pivotal point, and to the finger near its point.

The adjustment ofthe pawl to control the extent of the movement of the ratchet is effected by means of a pin, h', and a series of holes in the carrier H, that limits the forward movement of the arm k.

This device should be accompanied by a series of drill-rods of various lengths, in order to bore the various depths of holesv that may be required.

The operation of my device is as follows: `The platform B having been so located and leveled that the leg h rests beside the spot where the hole is to be bored, and the hammers revolve ou an even axis, the drill-rod J is set in the socket, and motion given the hammers by means of crank E', shaft E, and arms F. rIhe descending hammer will deliver its blow squarely on the head of the drill-rod, as shown by dotted lines in Figs. 1 and 1l of the drawings forming a part of this specification, and be momently checked and crowded olf one side ofthe head of the drill-rod by the arm F and slotted plate f, which continue right on in their revolution without being checked. During this movement the hammer will be forced to the upper and outer end of the slot, as shown in Fig. 12 of the drawings, and will then, immediately upon leaving the drill-rod head, be carried back to the opposite end of the slot, which is its normal position, by the elasticity ofthe rod g. After passing the head of the drill-rod the inner edge of the triangular head Fstrikes the arm 7c of the pawl K, as shown in Fig. 3 and dotted lines in Fig. l of the drawings, which communicates motion to the drill-socket and ro tates it one or more notches, thereby turning the drill-rod before the next blow is delivered. This operation is continued until the hole is deep enough or the drill-rod is sunk too low to receive the blow fairly. In the latter case a longer drill-rod is substituted and the operation continued.

Having thus described my invention, I claiml. In a percussion-drill, a revolving hub having a hammer attached thereto by an elastic rod, substantially as shown and described.

2. In a percussiondrill, the combination, with a suitable support, of a shaft, a hub bearing an arm provided with a slotted head, and a rod provided with a hammer, substantially as shown and described.

Y 3. In a percussion-drill, the combination of the rod g, having a knob, a conical hollow clamp, g', constructed in two sections for receiving the knob, the hammer G, and a nut, all arranged and operating substantially as shown and described.

4. In a percussion-drill, the combination ot' a hub having depressions f j", with a rod,g, having an upset end, a washer, L, having depressions l, and a shaft with a nut, substantially as shown and described.

5. In a percussion-drill, a vertical cylinder, in combination with an adjustable center post bearing a series of rotating hammers, and a drill-holding device, substantially as shown and described.

6. In a percussion-drill, the combination of the shaft E and suitable supporting devices with the frame D, drill-carrier H, socket I, and pawl K, substantially as shown and described.

, 7. In a percussion-drill, the combination of the drill-carrier H, socket I, and pawl K, extending outward to receive the blow of the head F', and having a linger and suitable springs, for the purpose specified.

8. In a percussion-drill, the combination of suitable supporting devices, a shaft, E, and arm F, having an angular head, with the pawl and I f5- IOO 

